Initial commit (033d08f7) · Commits · examples / Java In a Nutshell 4th Edition

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Changes for JavaNut4Examples/3-1: 20 added lines, 0 removed lines.
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		public class Circle {
		// A class field
		public static final double PI= 3.14159; // A useful constant

		// A class method: just compute a value based on the arguments
		public static double radiansToDegrees(double rads) {
		return rads * 180 / PI;
		}

		// An instance field
		public double r; // The radius of the circle

		// Two instance methods: they operate on the instance fields of an object
		public double area() { // Compute the area of the circle
		return PI * r * r;
		}
		public double circumference() { // Compute the circumference of the circle
		return 2 * PI * r;
		}
		}

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Changes for JavaNut4Examples/3-10: 19 added lines, 0 removed lines.
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		// This method creates and returns an Enumeration object
		public java.util.Enumeration enumerate() {

		// Here's the definition of Enumerator as a local class
		class Enumerator implements java.util.Enumeration {
		Linkable current;
		public Enumerator() { current = head; }
		public boolean hasMoreElements() { return (current != null); }
		public Object nextElement() {
		if (current == null) throw new java.util.NoSuchElementException();
		Object value = current;
		current = current.getNext();
		return value;
		}
		}

		// Now return an instance of the Enumerator class defined directly above
		return new Enumerator();
		}

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Changes for JavaNut4Examples/3-11: 14 added lines, 0 removed lines.
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		public java.util.Enumeration enumerate() {
		// The anonymous class is defined as part of the return statement
		return new java.util.Enumeration() {
		Linkable current;
		{ current = head; } // Replace constructor with an instance initializer
		public boolean hasMoreElements() { return (current != null); }
		public Object nextElement() {
		if (current == null) throw new java.util.NoSuchElementException();
		Object value = current;
		current = current.getNext();
		return value;
		}
		}; // Note the required semicolon: it terminates the return statement
		}

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Changes for JavaNut4Examples/3-2: 11 added lines, 0 removed lines.
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		public class Circle {
		public static final double PI = 3.14159; // A constant
		public double r; // An instance field that holds the radius of the circle

		// The constructor method: initialize the radius field
		public Circle(double r) { this.r = r; }

		// The instance methods: compute values based on the radius
		public double circumference() { return 2 * PI * r; }
		public double area() { return PI * r*r; }
		}